Spezifische W?rmen bei tiefen Temperaturen

Ohne Zusammenfassung     

Adsorption of Propene on Neutral Gold Clusters in the Gas Phase

The adsorption of propene on neutral gold clusters is investigated in a collision cell under a few collision conditions. The adsorption reaction is studied by pressure‐dependent kinetic measurements and delayed unimolecular dissociation of the excited Au_n?propene complexes. The cluster size (n=9–25) and temperature (T=90–300 K) dependence of the propene adsorption is analyzed. Strong size dependences of the absorption reaction are observed; a larger propene adsorption probability was found for gold clusters composed of an even number of atoms. Propene binding energies are estimated by comparison of the temperature‐dependent unimolecular dissociation rates with rates obtained by using statistical RRKM modeling. The Au_n–propene binding energies decrease non‐monotonously with cluster size and are in the range of 1.2–0.85 eV for n=9–25. Finally, the bonding of C₃H₆ on Au_n is qualitatively described and similarities with the absorption of CO molecules on gold clusters are discussed.     

Power‐to‐Gas

The power‐to‐gas concept is a promising technology to chemically store energy and therefore a feasible approach to mitigate the challenges of energy transition. Heterogeneous catalysis plays a crucial role in CO₂ conversion to methane using nickel based catalysts. A thorough catalyst characterization facilitates the synthesis of optimized catalyst systems. The determination of reaction kinetics is fundamental for industrial reactor design.     

Algorithms for spline wavelet packets on an interval

The aim of this paper is to describe decomposition and reconstruction algorithms for spline wavelet packets on a closed interval. In order to generate packet spaces of dyadic dimensions, it is necessary to modify the approach for spline wavelets on an interval as studied by Chui, Quak and Weyrich in [3, 11]. The first author was supported by the Department of the Air Force, contract F33600-94-M-2603, and the second author by the Department of Defense, contract H98230-R5-93-9187.     

Darstellung,Isolierung und Charakterisierung gemischter Selenocyanatoäthylendiamin-Chrom(III)-Komplexe

Preparation, Isolation, and Characterization of Mixed Selenocyanatoethylenediamine Chromium(III) Complexes cis-[Cr(NCSe)₄(en)]^? and cis-[Cr(NCSe)₂(en)₂]⁺ are prepared for the first time. They are separated by column chromatography on alumina and characterized by the chromium content and the spectra.     

Extraktionsverhalten von Rutheniumnitrosyl-Komplexen in salpetersauren Lösungen

Analytical and Bioanalytical Chemistry - Lösungen von Rutheniumnitrosylnitro-, Rutheniumnitrosylnitronitrato- und Rutheniumnitrosylnitrato-Komplexen lassen sich mit Hilfe von...